Last weekend I was installing some 2 x 4 blocking for a bathroom cabinet, and I really struggled to drive ... the screw has broken. Spax and GRK screws usually come packaged with a Torx T20 ...

Also, given that they are recycled cabinets, I wouldn't advise using the screw holes from the previous installation. You don't want to drive a screw into an existing hole and hit a snapped-off ...